SUITLAND, Md. -- Police are asking for the public's help in the search for the person who killed a pastor who was gunned down in front of his Prince George's County church.

Milton Leon Moore, 50, was found shot in the parking lot in front of the Warriors For Christ Ministries in the 2400 block of Brooks Drive in Suitland on Wednesday, News4 reported.

Investigators said the shooting occurred at about 7:30 a.m. in front of the church, which also holds a homeless shelter that had children inside.

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Police said the married father of four was walking toward the church when he was shot once in the head.

"As he was going through the door, somebody fired multiple shots at him," Prince George's County Police Cpl. Diane Richardson said. "One of the gunshots struck him."

Moore was pronounced dead Wednesday evening after being hospitalized in critical condition.

Witnesses said they heard an argument before the shots were fired. One witness said she heard three shots fired and that one of the shots was muffled.

Other witnesses on a nearby walking track told police that after hearing the shots, they saw two people run away from the church. Police do not know if those people were involved in the shooting.

Those who knew Moore mourned his loss and expressed sorrow for his killer.

"You want to shoot a pastor, a man of the cloth. That's not good," Moore's friend Ronald Lewis said. "Because therefore, not only do you have to answer to the pastor, but you have to answer to God now."

Drew-Freeman Middle School next door was put on lock down while police searched the school to make sure the shooter or shooters were not in the building.

Police do not have any suspects or motives but they do have some leads and an investigation is under way.

Anyone with information about the shooting should call police at 301-772-4925 or Crime Solvers at 866-411-TIPS.

Stay with News4 and nbc4.com for more information.