SALEM – Javron Walczak, the 16-year-old Lynn teenager charged with the fatal stabbing of another teen during a drug rip-off this summer remains held at the Plymouth House of Corrections without bail.Walczak, of 121 Fellsmere St., Lynn, wearing a black polo jersey with black beaded rosary around his neck, black pants and black work boots, stood by his attorney Jonathan Shapiro during his arraignment Monday afternoon in Salem Superior Court.He pleaded innocent in a soft voice to a charge of murder in the second degree, armed assault with intent to murder and assault and battery with a dangerous weapon in connection with the Aug. 10 incident in the Highlands part of Lynn where Rene Valdez, 16, of Medford was killed and Darren Colucci, 17, of Swampscott received a minor stab wound.Assistant District Attorney Marsha H. Slingerland insisted to Judge Timothy Q. Feeley that Walczak be held without bail.She told the judge that the case had been under a grand jury investigation since late September. Walczak was indicted on Oct. 27.She said Valdez, who had previously bought marijuana from Walczak, arranged to purchase marijuana from him with the intention of robbing him.Shortly before 11 p.m., Valdez and Colucci arrived on bicycles at the designated area in the Highlands, outside 121 High Rock St.A 12-year-old boy told authorities he saw from his window a large bushy haired man, about 6 feet and 300 pounds and two other skinny men get into a confrontation.He observed the larger man pull out a knife and stab the man with the pony tail once in the neck and blood was spraying everywhere.That man was Valdez, who actually sustained many more stab wounds to his body, Slingerland noted.Walczak, who was arrested later that afternoon, was identified by Colucci as the stabber through a photo array shown to him by police.The knife never has been recovered.The suspect’s attorney, Jonathan Shapiro of Boston, pleaded with Feeley to set a bail amount, suggesting $10,000 with conditions of release and monitoring.He maintained that the case is “not really a murder;” that his client was acting in self-defense” while pointing out that Valdez and Colucci had planned to rob Walczak.”He (Walczak) is not a dealer. He would from time to time sell it to get money for his own use,” insisted Shapiro.Shapiro suggested that Walczak live with his grandparents as custodians, saying they are willing and able to take him until the case is resolved.Feeley explained that he had to set bail, but would with specific conditions while noting that Walczak could not live with his mother or stepfather.Slingerland objected strongly to the grandparents as custodians, saying it was “not appropriate” since Walczak is just 16 and that there is an extreme “risk of flight.”In view of the time already spent on the case Monday afternoon, more than one hour, the judge delayed setting any cash bail and continued the case to Friday afternoon, Nov. 19.In the meantime, Walczak remains held without bail at the Plymouth House of Corrections.