Two Prince George's County men have been convicted for their roles in separate fatal shootings, officials said.

Ronald Lee Ragland, 56, was found guilty of shooting a father and son in 2010, killing the father, according to the Prince George's County state's attorney's office. Dominic Givens, 22, was convicted in the slaying of a 30-year-old man who was killed during a robbery at a District Heights apartment complex in 2011.

"These convictions have brought justice to the families of the victims and made our neighborhoods safer," Prince George's County State's Attorney Angela Alsobrooks said.

Ragland was convicted of shooting his Brandywine neighbors: Robert Mitchell Sr. and his son Robert Mitchell III.

The Mitchells moved across the street from Ragland in 2007 and had years of disputes with the defendant. Prosecutors said that on May 2, 2010, Ragland purposefully started an argument with the son, called him into the street under the premise of a fight and shot him.

Ragland then shot Mitchell Sr., who was sitting in a car, officials said. The defendant then retrieved an inoperable gun, placed it in Mitchell Sr.'s lap and claimed to police that he shot the father and son in self defense. However, prosecutors were able to disprove the self-defense theory, and a jury convicted Ragland. He is scheduled to be sentenced on May 3 and faces 100 years in prison.

After a separate trial last week, a jury convicted Givens of his role in the shooting death of 30-year-old Marvin Darrell Tomlinson.

On Nov. 15, 2011, Tomlinson, another adult and four teenage boys were at an apartment-complex playground when Givens and three other people pulled up to the area in a van. Givens and the other assailants exited the vehicle, accosted the victims with a gun and made the victims turn over their shoes, jackets and items in their pockets, prosecutors said.

The assailants struck Tomlinson with a gun, but Tomlinson was able to knock the weapon out of their hands and yell for the teens to run away, prosecutors said. The victims other than Tomlinson escaped, but the assailants regained control of the gun and then shot and killed Tomlinson.

Givens is scheduled to be sentenced on April 26 and faces up to 120 years in prison. Two of his alleged coconspirators are awaiting trial, and the third was killed in an unrelated incident after posting bail.