Updated

Police have arrested a man on suspicion of murder after his brother was fatally shot during a weekend family birthday celebration in South Los Angeles.

Los Angeles police Lt. Jeff Nolte says 40-year-old Louis Hill was arrested Sunday and booked on suspicion of murder.

Nolte says Louis Hill is suspected of fatally shooting his 48-year-old brother Derrick Hill on Saturday shortly before 9 p.m. on the 800 block of E. 78th Street.

Mother Doris Hill said the family was celebrating her granddaughter's ninth birthday with ice cream and cake when Louis ran in and said he'd been jumped on the corner.

His big brother Derrick went out to see what happened and the family next heard a gunshot. She said someone else shot Derrick once in the head.