BOSTON, March 17, 2014—A West Roxbury man was formally charged today with his father’s shooting death in the home they shared, Suffolk County District Attorney Daniel F. Conley said.

MARK TOMAS REGAN (D.O.B. 7/21/80) was arraigned today in West Roxbury Municipal Court in connection with the fatal shooting of Mark Thomas Regan, 66. At the request of Assistant District Attorney David Fredette, Judge Franco Gobourne ordered the defendant held without bail.

Fredette told the court that Boston Police entered 105 Perham St. just before 8:30 Friday morning to perform a well-being check and found the victim deceased. They also found the defendant hiding in the building’s attic. The defendant was transported to Boston Police headquarters for an interview; he was placed under arrest late Friday.

The ongoing investigation led to the recovery of a handgun inside the attic. That handgun, Fredette said, was consistent with the weapon believed to have killed the elder Regan, but it has not yet been tested by ballisticians. The investigation also revealed that some of the victim’s co-workers, concerned about his absence from work, visited the home on Wednesday. The defendant allegedly told them that he wasn’t home and was out with friends. The victim’s car was outside the house.

The defendant is currently on probation following a 2½-year house of correction sentence on a 2010 Suffolk Superior Court conviction for unlawful possession of a firearm and assault with a dangerous weapon, Fredette said.

Regan is represented by attorney James Greenberg. He will return to court on April 16.

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All defendants are presumed innocent until and unless proven guilty beyond a reasonable doubt.