A Rockville man was found guilty of murder yesterday in the stabbing death last June of his brother-in-law, David Simms Jr., 32, of 920 Old Bucklodge Rd., Boyds, Md.

A jury found Royce Alreese White guilty of second-degree murder, assault with intent to maim and battery, after a three-day trial before Montgomery County Circuit Court Judge Rosalyn B. Bell. White could be sentenced to up to 30 years in prison, prosecutors said.

White, 22, was charged with stabbing Simms once in the jaw during an argument outside a neighbor's home at 406 McCleane Ct. in Rockville, according to Assistant State's Attorney Eric E. Wright.

The argument centered around Simms' alleged beating of his wife, who was White's sister, the prosecutor said. The sister had gone to a crisis center for battered wives, and Simms had been trying to find her, when the argument occurred on the front lawn of a house across from White's Rockville home, the prosecutor said.

White testified that moments before the stabbing Simms had pulled out a gun, and when the stabbing occurred, Simms was threatening White's father, according to Wright.

Another witness, however, said that although Simms was carrying a gun, he had not drawn it, and was merely talking to White's father when he was stabbed, Wright said.