An investigation is underway after a contractor was found dead at a Northeast Side apartment complex. Police say they believe he may have been killed by a coworker. It happened at an apartment complex off Nacogdoches Road near Loop 410. The two men were reportedly staying at the complex while work was underway and the victim's body was found in one of the apartments. It is believed the two men got into an argument overnight leading to the violence. An investigation continues.