ORLANDO, Fla. -

A 50-year-old man was shot and killed and his teen son was pistol-whipped Wednesday morning after five assailants kicked in the door of their Orange County home, authorities said.

Orange County deputies said John Brennan was shot dead around 4:15 a.m. inside his home on Bridlewood Avenue near Dean Road in Union Park.  Brennan was pronounced dead at the scene.

Brennan's son was seen getting his head bandaged at the scene before he was taken to a hospital.  He was later released, according to deputies.

The motive for the shooting is not known, and deputies told Local 6 that it's not known if anything was taken from the home.

The culprits concealed their faces with clothing, deputies said.  It's not known if they drove off or ran from the scene.

An investigation is ongoing.

Stay with ClickOrlando.com for this developing story.