Maryland ? A man shot and killed his ex-wife, their three children and himself in a small-town park where they had met for the woman to hand over the youngsters for a visit, investigators said Friday.

Their bodies were found Thursday evening in the tiny community of Unity when Maryland-National Capital Park Police officers stopped in the deserted park after noticing two cars with their engines running, said Wayne Jerman, Montgomery County assistant police chief.

The bodies of Gail Louise Pumphrey, 43, of Woodbine, and the three children – ages 6 to 12 – were found in the cars, Jerman said. David Peter Brockdorff, 40, of Frederick, was found nearby with what appeared to be a self-inflicted gunshot wound. Police said they recovered a .22-caliber rifle near his body.