NEW : The arrested man is Ricardo Valles de la Rosa , municipal police spokesman Jacinto Seguro said . Suspect , Ricardo Valles de la Rosa , 42 , also sought in connection with another slaying . The suspect is described as a Hispanic man wearing all black and armed with an assault rifle who fled the scene on foot after he was shot by police officers at about 8 p.m. near East 149th Suspect called member of Aztecas street gang , which is affiliated with Juarez drug cartel .
NEW : Suspect , Ricardo Valles de la Rosa , 42 , also sought in connection with another slaying . The suspect is described as a Hispanic man wearing all black and armed with an assault rifle who fled the scene on foot after he was shot by police officers at about 8 p.m. near East 149th Suspect called member of Aztecas street gang , which is affiliated with Juarez drug cartel .