A 23-year-old man was shot and killed in his Gaithersburg home as he was running to the aid of an 18-year-old brother who was confronting a pair of home invaders, according to a relative of the dead man.

Ronald Michael Lone III was killed in the attack and his brother Robert was treated for a head laceration after being struck with a gun, according to relative Terry Seamons.

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At least five family members were home at the time of the 10 p.m. attack, including a disabled grandfather the family is caring for.

The two attackers dressed in dark clothing had forced their way into the home in the 2900 block of Muncaster Mill Rd. when they were confronted by the brothers.

Police say the attack was not random and that the family was intentionally targeted, though investigators have not publicly theorized why.