The Galveston County, Texas, sheriff has released a sketch of a man believed to have been with two Houston women hours before they were killed.

Britney Cosby and Crystal Jackson, both 24 years old, were found dead outside a convenience store in Port Bolivar on last Friday, reports KHOU. Their bodies were discovered near a dumpster. According to local station KRIV, investigators say Cosby was beaten and Jackson, her girlfriend, was shot.

Detectives are now asking for the public’s help in identifying the man in the composite sketch. He is described as a black man, possibly in his late 20s to early 30s. He would have been last seen with the women and may be driving a new silver 2006 Kia Sorrento that belonged to Cosby. Police are continuing to search for the missing vehicle, which could be a key piece of evidence in helping solve the tragic killing. The vehicle has paper Texas tags.

Bolivar+Suspect+Sketch+Web Police released this composite sketch of a male suspect they want to question in connection to the killing. Photo: Galveston County Sheriff's Office

The couple had been together for two years. They lived at the home of Cosby’s great-grandmother, and relatives say that the two women had traveled to Galveston for Mardi Gras. "I never heard from them anymore, and that night I didn't hear from her," Cosby's great-grandmother, Annie Lee Cosby, told KTRK. Crystal Jackson’s father, the Rev. Ivan Jackson, told the station he last spoke to his daughter on March 5.

Family members are now passing out fliers in the neighborhood where the bodies were discovered and are asking the public for any help in solving the case. Cosby’s sister, McDade Cosby, says the family simply wants answers.

"Just come forward, just to give us closure as a family. Just come forward, 'cause we need closure at this point," said McDade Cosby.

Jackson, who was the mother of a 5-year-old daughter, worked as a security guard. Cosby worked as a barista at Starbucks.

KTRK reports that police believe that the couple was murdered, but officers have yet to offer any additional details on how the victims and the suspect in the sketch are connected. They added that they believe the women were killed in Houston before their bodies were dumped at the convenience store where they were found.

Those with information about the case are asked to contact the sheriff’s office at (866) 248-8477 or Galveston County Crime Stoppers at (409) 763-8477.