A 17-year-old Buffalo boy is being sought by Buffalo police as a “person of interest” in the stabbing death of Roberto Leon in the 400 block of Tonawanda Street about 11 p.m. Feb. 23. Detectives said Angel Lozada is known to frequent that section of the city’s Riverside area. Anyone with information regarding his whereabouts is asked to call or text Buffalo police through the confidential tipline at 847-2255 or to e-mail the department through its website at