A 20-year-old woman and a 72-year-old man were “intimate friends” until their romance turned to violence, said Denver District Attorney’s spokeswoman Lynn Kimbrough.

Jennifer Stroth was arrested on a domestic violence charge Feb. 17 in Loveland.

An investigation turned up evidence of two earlier knife attacks when the couple shared a home in the 4900 block of Raleigh Street in Denver, Kimbrough said. Stroth is accused of stabbing him Feb. 1 and Feb. 16.

The man was seriously injured, said prosecutors, who didn’t identify him because he is an alleged victim of domestic abuse. Stroth is in the Larimer County jail.