Law & Order: Special Victims Unit (1999)

Season 4: Episode 3

When an elderly woman with Alzheimer's breaks into an apartment, the detectives discover she had been abused, triggering memories of similar crimes from her childhood. They discover that she had been released from a nursing home to the custody of her financially scheming son who becomes the prime suspect. However, they go back to the nursing home to find a pair of suspects; the real crime is what's being done to the elderly.