Anthony Mamboleo Nyakeo, 53, was convicted Wednesday of aggravated sexual assault of an elderly or disabled person, the Fort Worth Star-Telegram reported.
Nyakeo could have been sentenced to probation but jurors on Thursday sided with prosecutors and sentenced him to two life terms in prison.
Nyakeo worked at a nursing home in Grapevine, Texas, about 25 miles northeast of Fort Worth.
In January 2018, prosecutors accused Nyakeo, a Kenyan immigrant to the U.S., of raping the elderly woman after DNA linked him to the attack, the Star-Telegram reported.
During his trial, Nyakeo testified that someone must have planted his DNA from a used condom in the body of the victim.
The victim, whose identity has not been released, died last year from Alzheimer’s disease at age 75.
The Associated Press contributed to this report.