St. Martin parish deputies have arrested four men in the case of the headless body found in the Atchafalaya River. The four suspects were picked up in Lafayette.

They are 19-year-old Gustavo Acosta, 22-year-old Julio Rodriguez, and 34-year-old Jose Acosta; all from Mexico. A fourth suspect, 41-year-old Nelson Riverois is from Youngsville.

The victim has been identified as 27-year-old Mario Lopez, also from Mexico. Police found Lopez' headless, bullet-riddled body earlier this month.

Investigators aren't giving a motive and won't say how the victim knew the suspects. The suspects are in the St. Martin parish jail and police say the investigation is ongoing.

Two of the suspects had tattoos that may link them to the Mexican mafia.

"One of the things we're going to be focusing on in the continued investigation in the fact two of these people we suspect of being gang members," said Vernon Francis of Immigration and Customs Enforcement.