Fla. teen admits killing mother, boyfriend, has mental healh issues, say cops

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(CBS/AP) OLDSMAR, Fla. - Authorities say an 18-year-old with a history of mental health issues is charged with first-degree murder in the shooting deaths of his mother and her boyfriend.

The Pinellas County Sheriff's Office says Benjamin Bishop told investigators that he shot his mother, Imari Shibata, and her boyfriend, Kelley Allen, early Sunday following a series of arguments.

Detectives say Bishop called 911 after the shootings and surrendered without incident.

According to detectives, Bishop shot the victims with a shotgun he asked a friend to buy him so he could protect himself from gang members. Bishop couldn't buy the gun himself because he was on probation for a domestic batter incidnet involving Shibata.

Sheriff's spokeswoman Marianna Pasha says Bishop is on medication for mental health issues.

Bishop was held without bond Sunday. Jail records didn't show whether he had an attorney.