Fire-Former Tennis Star

In this photo provided by the Hillsborough County Sheriff's Office, flames destroy a mansion owned by former tennis star James Blake, Wednesday May 7, 2014, in a gated community in Tampa, Fla.

(AP Photo/Hillsborough County Sheriff's Office)

TAMPA, Fla. — Deputies say a Florida man shot his wife and two teenage children at the upscale home they rented, then set the house ablaze before killing himself.

Hillsborough County Sheriff's Col. Donna Lusczynski said at a news conference Friday that Darrin Campbell had purchased fireworks, gas cans and gasoline in the days before the family was killed.

Campbell shot his wife, Kimberly, and two children each in the head. Lusczynski says Campbell then scattered the fireworks and gas around the house before setting it ablaze.

Lusczynski says investigators are still working to determine a motive.