Dennis Hopper and wife Victoria

Dennis Hopper has filed for divorce from wife Victoria, TVGuide.com has confirmed.

Hopper, who's undergoing experimental treatment for prostate cancer, petitioned for it on Thursday. He cites irreconcilable differences and plans to provide spousal support, according to People.

Dennis Hopper starts experimental treatment for prostate cancer

Victoria is Hopper's fifth wife. The two have been married more than 13 years and have a daughter together, 6-year-old Galen. The 73-year-old actor, who late last year wrapped shooting the second season of the Starz series Crash, has requested joint legal and physical custody of Galen, People reports.