Police were called around 3:44 p.m. Monday to the 22000 block of Brown Farm Way for a possible domestic situation involving a person with a gun.
Manger said that gunfire could be heard in the background of 911 calls that sent police to the scene.
"First responders came to the scene, they located multiple fatalities and backed out of the house, believing it was not safe", said Capt. Paul Starks of Montgomery County Police Department. Authorities say Snyder shot and killed a resident, an out-of-town guest and a worker. Murphy was visiting the home, while Shotwell was doing work there, police said.
There were six people inside the house when Snyder began shooting, Manger said.
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Christopher Snyder had been holding his wife captive over the weekend in their home in Brookeville, Md., according to police.
County police as well as agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) are investing the deadly shooting. Snyder had been on the phone with police at the time, but shot himself when they entered. The suspect was on the phone with negotiators.
Officers breached the front door at 11 p.m., with Snyder still on the phone with negotiators, prompting Snyder to hang up. She told police she was being "held by him" over the weekend. Snyder's wife is cooperating with the police and was the one who confirmed that she was being held against her will by her husband. Manger also said police were not aware of any prior issues between Snyder and the victims.
According to reports, Snyder had a history of run-ins with police, and his address is listed as gun dealer Black Widow Enterprises, LLC.