The couple were married in 1996
Hollywood actor Dennis Hopper is being "pressured by his advisors and adult children" into filing for divorce, his wife has claimed.
Victoria Hopper said in court documents filed in Los Angeles, that the star had told her he did not want to divorce.
But Mr Hopper said "other people are insisting that he take care of them upon his death".
The 42-year-old is also seeking full custody of the couple's 6-year-old daughter, Galen.
Mrs Hopper claimed in her legal statement that the divorce was a means to cut her out of her husband's estate as stated in the terms of the couple's prenuptial agreement.
"I believe that the filing of the present dissolution action is a result of estate planning by other family members," she said.
She added that her husband's medical and mental state had become unpredictable due to his declining health as he battles prostate cancer.
Mrs Hopper said she did not believe that he "is capable of taking care of himself or his legal and financial affairs" and is unable "of making sound decisions in the best interests of our daughter."
She asked for a judge to allow her husband supervised visits with their daughter for up to an hour per day, depending on his health.
Among her requirements were that the star remove all guns from the family's house and refrain from smoking "medicinal marijuana and other non-prescription drugs" at least six hours before the visits.
Mr Hopper, who married his wife in 1996, cited "irreconcilable differences" for the split.
The Easy Rider star, 73, was diagnosed with prostate cancer in September.