A 55-year-old man has been charged with murder in connection with the fatal stabbing of a woman at a home for the mentally impaired in Santa Monica Sunday, Aug. 1 police said.

Santa Monica police were called at 8:03 a.m. regarding an unknown trouble at The Manor, 1905 Pico Blvd., where a staff member found a 61-year-old woman with fatal stab wounds in the inner courtyard, Sgt. Dave Hunscke said. The victim, identified by the county coroner as Rosalind Olson, was a long-term resident of the semi- independent living facility for the mentally impaired, police said.

The suspect, Rigoberto Ruiz, 55, who is a resident of an affiliated facility in the 2000 block of Pico Boulevard, was arrested at the scene without incident, police said. A weapon was recovered at the scene.

The Los Angeles County District Attorney’s Office charged Ruiz Tuesday, Aug. 3 with murder and probation violation in connection with Olson’s death, police said. Ruiz pleaded not guilty to the charges.

Santa Monica police Sgt. Robert Almada said Ruiz has an extensive criminal record involving crimes of violence.

The suspect and victim had no known relation other than both being residents of The Manor, Almada said. The incident, which is the first homicide in Santa Monica this year, was described by police as a random attack.

Olson was a resident who never caused any problems and was a quiet woman who kept to her self, Almada said.

The motive for the attack is under investigation.

Anyone with additional information regarding this incident is asked to contact Sgt. Almada at (310) 458-8486, Investigator Dan Larios at (310) 458-8937, or the Santa Monica Police Department at (310) 458-8495.