Kim Richards' ex-husband Monty Brinson has died after a long battle with cancer. Brinson was 58.

"We have lost Monty Brinson after a brave battle with cancer," Rick Hilton, Richards' brother-in-law, revealed on Instagram Sunday night. "His heart was as big as the moon and he was loved by all he met. He will be sorely missed. I love you always!"

Brinson and Richards were married from 1985 to 1988. The couple, who share 29-year-old daughter Brooke, stayed close following the divorce, with the Real Housewives of Beverly Hills star taking care of Brinson in recent years as his lung cancer worsened.

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Richards and Brinson always maintained a positive attitude throughout his illness. On his birthday a few weeks ago, Richards shared a loving post dedicated to her ex. "I love you so much. We have come so far, let's keep it going," Richards wrote. "I'm right by your side forever! I wish for you happiness, courage, peace, laughter, love, strength and Every [dream] you've EVER DREAMED OF!!!!"

"I'd like to thank all the people who have crossed my path you've all touched my heart may everyone have a blessed night and much love to everyone," Brinson wrote on Instagram a few days before his passing.