NYPD detectives have released new surveillance images of a suspect wanted in connection with the fatal stabbing of 27-year-old Martin Marquez. The incident occurred on October 7 at approximately 2:00 p.m. inside an apartment building located at 1555 Grand Concourse in the Mount Eden neighborhood of the Bronx. According to police sources, Marquez arrived at the location to confront the individual responsible for his death over a prior dispute. A verbal altercation ensued, which escalated into a physical attack resulting in a stab wound to the neck. Upon receiving a 911 call reporting the stabbing in the building's hallway, officers from the 44th Precinct responded to the scene. They discovered Marquez with the fatal injury and EMS personnel transported him to Lincoln Hospital, where he was pronounced dead. The suspect remains at large, and no arrests have been made as the investigation continues. The released footage depicts the suspect speaking on a cellphone while wearing a black jacket, a gray hoodie, and pants featuring black, blue, and red colors. Authorities are urging the public to review the images and come forward with any information that could lead to the suspect's identification or capture. Individuals with relevant information are encouraged to contact the NYPD Crime Stoppers tip line at 800-577-TIPS. Spanish-speaking callers may dial 888-57-PISTA. Tips can also be submitted online via crimestoppers.nypdonline.org or through the official NYPD tips account on X, formerly Twitter, at @NYPDTips. All communications are kept strictly confidential. The NYPD emphasizes that any information provided could be crucial in resolving this homicide case and bringing the alleged killer to justice.