TEXAS CITY, Texas -

A suspect in the murder of a missing Pasadena man killed himself after a SWAT scene at a Texas City apartment, according to police.

Texas City police say they were assisting U.S. Marshals Wednesday morning to execute a warrant on the suspect when he barricaded himself in the apartment at the Windsor Estates apartments on the 2800 block of FM 2004 Road.

Police originally said he was holding his girlfriend hostage, but they say she was determined to be an active participant.

Authorities evacuated residents from nearby apartment units.

"I came in from school to change and get ready for work; everything was blocked off, there was a lot of SWAT here. They had stated there was a gentleman wanted for murder," said resident Jessica Peacock.

Police say after unsuccessful negotiations, the SWAT team deployed gas to try to get the suspect to surrender.

His girlfriend exited the apartment and was taken into custody.

Shortly before 1 p.m. the SWAT team entered the bedroom and discovered the suspect had hung himself in the closet, police say. He was pronounced dead at the scene.

The suspect's name has not been released.

"The gentleman who is the suspect, I don't know if it's a relative or friend, but he was just visiting. The gentleman who actually lives there, the older man, is the one who helped me carry out my garbage before," Peacock said.

No other injuries were reported.

According to Texas City police, the suspect was wanted in connection to a murder case in Harris County. The victim in the case is believed to be Jesus Leal Valdez, 41, who was found buried two feet beneath a chicken coop in northwest Harris County in the 5200 block of Mohawk St. over the weekend.

Authorities say Leal's debit card was used by a woman at several locations around the Houston area. However, authorities haven't yet said if this is the same woman police arrested during the SWAT standoff.