Hollywood was stunned by the unexpected death of Gleestar Cory Monteith on Saturday night. Hours earlier, Monteith was found dead in a Vancouver hotel room, though the cause of death was still unknown. Here's what his co-stars and fellow celebrities had to say about his sudden passing:
Grant Gustin: My thoughts are with Cory and the entire Glee family. Truly no words.
Ian Somerhalder: Its truly a sad day-an amazingly talented young man is gone.So sorry to the family, friends & fans of Cory Monteith.Such a good man.Truly.
Danielle Fishel: I am in shock about the horrible news of Cory Monteith's death. I wasn't lucky enough to know him but I am saddened today by this loss.
Jesse Tyler Ferguson: I am so sad to hear about Cory Monteith. He was a lovely person with a ton of talent. My heart goes out to his family and friends. RIP Cory.
Paula Abdul: I am shocked and deeply saddened by the heartbreaking news about Cory Monteith. My heart goes out to his family and Lea [Michele].
LeAnn Rimes Cibrian: Wow, just read the news about Cory Monteith. How sad, way too young. I hope he's at peace. Prayers go out to his family & friends.
Neil Patrick Harris: How sad to read about Cory Monteith passing away. What a shame. He was a lovely, kind, talented guy and will be missed.
Hilary Duff: Really sad about Cory Monteith's passing. Saying prayers for friends and family, what a difficult time...
Sophia Bush: I saw him a few weeks ago in NY, looking so happy. heartbreaking... #corymonteith
Katy Perry: Rest in peace Cory. My heart goes out to his family and loved ones. Our prayers are with you.
Rihanna: Cory Monteith, may your spirit be at peace, and may you fly with the angels... Heartbreaking, my prayers are with all of his loved ones!
Kim Kardashian: Just heard about the death of Cory Monteith. So sad. Prayers 4 his family. Praying 4 Lea too! Words cant describe what they must be feeling.
Ricky Martin: I just heard the news.This is so sad. My heart goes out to his family & friends, specially Lea [Michele]. Rest in peace Cory #RIPCoryMonteith
Lance Bass: Devastated about the news of Cory Monteith — such an incredible guy — my thoughts are with his family and friends.
Melissa Joan Hart: So sad to wake up to another young person gone too soon.
Nick Jonas: So sad to hear the news about Cory Monteith. Praying for his family and friends.
Ellen Page: So heartbreaking to hear about Cory Monteith...my deepest condolences to his friends and family.
Olivia Munn: Shocked and saddened by the tragic death of Cory Monteith. All my love to his family, friends & girlfriend. #TooSoon
Denise Richards: this is devastating....my heart goes out to @CoryMonteith & his loved ones....& cast and crew of #Glee a tragic loss....#RIPCoryMonteith
Beverley Mitchell: Absolute shock to hear of Cory Monteith's death. So incredibly sad. Sending love and prayers to his friends and family. What a huge loss!
Retta: Cory Monteith. Stunned. So sad. Condolences. God this day f----- sucks.
Josh Groban: While I only met him briefly on set, I remember him to be an extremely sweet guy. Tragic. RIP Cory.
Alyssa Milano: Beautiful man! Why did you leave us so soon? Rest with the angels, Cory Monteith.
Cheyenne Jackson: What I will remember about Cory Monteith is that he was talented, funny and absolutely kindhearted. We lost a gentleman. RIP.
Taylor Swift: Speechless. And for the worst reason.
Harry Shum Jr.: At this time, please send nothing but love and light. This tragic news still doesn't seem real to me. I love you Cory.
Mark Salling: no.
Romy Rosemont: Cory was a gentle, sweet soul & I am grateful to have had the chance to play his Mom. My heart is w/ his family, his Glee family & sweet Lea
Kristin Chenoweth: RIP CoryMonteith. You will be loved. Always.
Dot Marie Jones: I have no words! My heart is broken. Cory was not only a hell of a friend, he was one amazing man that I will hold close to my heart forever. I am blessed to have worked with him and love him so much! My heart is with his family and our whole Glee family! I love you all!
Zooey Deschanel: This is such sad news about Cory Monteith. What an absolutely tragic loss of a very talented young man.
WATCH: Cory Monteith's 10 most memorable Performances on Glee
Nina Dobrev: I'm gutted. Shocked and saddened to hear the news, my heart goes out to Cory's family and friends. Let's respect their space as they grieve.
Damian McGinty: The guy I shot my first acting scene with. The nicest guy I've met. Can't believe it.
Bryan Wynbrandt: Crushed to hear about Cory Monteith. Had the pleasure to write for him on Kyle XY. Enjoyed watching his rapid rise to fame. #RIP
Josh Sussman: I am so saddened to hear about Cory. He was such a great guy/Super-kind &warm. A tragic loss. My heart goes out to all his friends & family.
Alex Anders: Heartbroken by the loss of my friend Cory Monteith. Praying for his family and loved ones. Such a good hearted man that will be sorely missed.
David Boreanaz: R.I.P. Cory Monteith. #Glee.
Kat Dennings: I can't fully process this news. Tragic, tragic loss of a young, promising, talented man. Cory Monteith, rest in peace
Beth Behrs: Shocked and so heartbroken to hear the news about Cory. my heart goes out to his friends and family.
Julie Plec: Oh my god. Oh, no. There are no words. I'm so sorry. Heartbreaking. #RipCoryMonteith
Iqbal Theba: OMG!! My Cory...
Katie Cassidy: So sad to lose a dear friend & talented man... Cory Monteith you'll always be remembered.
Anthony Rapp: My thoughts go out to the friends and family and colleagues of Cory Monteith. Always very sad to see folks lose that battle.
Greg Grunberg: R.I.P. Cory Monteith. What a terrible, terrible tragedy. So young. So talented. So sad.
Demi Lovato: #RIPCoryMonteith... So unbelievably tragic. Please #prayforLea..
Lana Parrilla: RIP Cory Monteith. Condolences to his family and friends. So sad. #Glee
Lance Bass: Devastated about the news of Cory Monteith. Such an incredible guy. My thoughts are with his family and friends.
Kaley Cuoco: #CoryMonteith no words. Prayers. Thoughts [with] his family. This is terrible. Can't speak.
Lamorne Morris: Really awful to lose someone so young and talented. RIP @CoryMonteith
Scott Porter: This news of Cory Monteith's death just shakes me to my very core. So young. My thoughts and prayers to his family and friends.
Monica Potter: Oh my god, my heart & prayers go out to the family & loved ones of Cory Monteith. This is heartbreaking. Tragic.
Joel McHale: Way too soon. A very nice & good guy.
Josh Gad: RIP Cory Monteith. Gone way too soon.
Matt Lanter: Sad news. ...Shocking and terribly sad. #Cory
Phoebe Tonkin: Speechless. Sending strength and light to all of Cory's friends and family. Respect their privacy. x
Chloë Grace Moretz: I just heard about Cory Monteith.. Rest in peace, everyone close to him and affected by this loss you're in my prayers.
Nolan Gerard Funk: Oh my God. Cory. Man. I can't. Praying for you man. You were a good soul.
Jaime King: #CoryMonteith a loss of words. May you rest in Peace. Thoughts and prayers to his family and friends.
Tyler Shields: Wow I am speechless about Cory Monteith such a sweet and amazing guy to young to amazing we always talked about shooting so sad!
Trevor Donovan: Cory was taken from this world too soon... I'm glad I had the opportunity to know him. #RIP CORY
Holly Marie Combs: Life is hard. Be nice. For you never know what another could be struggling with or against. You never know. #RipCoryMonteith
Rachelle Lefevre: Thoughts & prayers go out to parents and loved ones of Cory Monteith. So sad. Rest in Peace.
Rumer Willis: I am truly saddened to hear about Cory Monteith. What a talented and sweet guy. My prayers go out to his family and loved ones.