Deputies: Benjamin Bishop killed his mother and former swim coach on early Sunday morning

OLDSMAR, Fla. - An Oldsmar teenager faces two counts of first degree murder in the deaths of his own mother and her live-in boyfriend.

According to the Pinellas County Sheriff's Office, 18-year-old Benjamin K. Bishop admitted to shooting his mother, 49-year-old Imari Shibata, and 49-year-old Kelley Allen after a series of arguments on Saturday.

Officials say Shibata was a certified nursing assistant, and Allen was a swim coach with the Westchase Community Association. He had reportedly been Bishop's own swim coach several years ago.

Police say the shootings happened around 1:30 a.m. Sunday at 205 Cedar Key Court.

The investigation has revealed that Bishop, who is unemployed, pawned a number of electronic items in order to get money to purchase a 12-gauge shotgun.

Sheriff Bob Gualtieri said Bishop could not buy the shotgun himself, because he was still on probation for a 2011 domestic battery incident, where he reportedly hit his mother and tried to strangle her.

According to reports, Bishop told a friend he wanted the firearm for protection against gang members.  The unidentified friend bought the gun for $279 at a local shop a couple weeks ago, officials say.

Investigators say Bishop hid the shotgun in the attic of the family's home until a few days ago, when he brought it down to his bedroom dresser.

In statements to detectives, Bishop reportedly said that on Saturday his mother told him to get a job, take medication for his mental health issues, and start paying rent.  Bishop also had a discussion with Allen over the laundry, according to reports.

Bishop then told investigators he became angry, loaded the weapon, and shot Shibata and Allen in their bedroom.  He then allegedly reloaded the shotgun and shot them again.

Gualtieri said it was Bishop who called 911 to report the shootings, and surrendered to deputies at the front door.  He was taken into custody early Sunday morning, and charged after his questioning - in which he admitted to the shootings.

Records show that the sheriff's office has responded several times to the residence since 2006, and that Bishop requires medication for mental health issues, but has not always taken it as needed.

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