The prime suspect in a quadruple homicide of a Romeoville family had a romantic relationship with one of the victims he is believed to have killed in September, Romeoville police said Thursday.

       Authorities said their investigation into the deaths of Alberto Rolon, 38, Zoraida Bartolomei, 32, and their young sons was not complete, but they confirmed that the suspect, Nathaniel Huey Jr., 31, had been in a relationship with Bartolomei.

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       Both Bartolomei’s husband and Huey’s girlfriend, Ermalinda Palomo, were aware of the relationship, police said.

       The couple and their children, ages 7 and 9, were found shot to death in their home in the 500 block of Concord Avenue on Sept. 17. Huey and Palomo died days later in an explosive car crash in Oklahoma.