DEL RIO, Texas — A woman who remained on the run after being indicted as part of a human smuggling operation linked to the deaths of seven migrants found in a Laredo railyard is in federal custody.

Karina Garcia was arrested in Del Rio on Sunday, according to federal court records. In July, a federal grand jury in Del Rio indicted Garcia along with 10 others from Texas, Mexico, Guatemala and Honduras in connection with the alleged smuggling ring.

RELATED: 11 face charges in deadly Del Rio-to-San Antonio smuggling operation

Prosecutors allege the group operated a human smuggling network that used cargo trains to move migrants farther into the United States after they crossed the border illegally.

According to court documents, seven migrants, including a 14-year-old child, were smuggled across the Rio Grande from Acuña, Mexico, into the Del Rio area before being taken to Union Pacific railroad tracks on May 9.

Authorities said the shipping container had no ventilation or cooling system and was locked from the outside, preventing anyone inside from escaping.

The train traveled east to San Antonio, where prosecutors say smugglers opened the container, found the migrants in distress and fled, allegedly leaving one victim’s body near the railroad tracks while abandoning the others inside the container.

The following day, a Union Pacific employee at the rail yard in Laredo spotted a leg protruding from the shipping container. Six migrants were found dead inside. Investigators later found a seventh victim near railroad tracks in San Antonio.

The victims included four Mexican nationals and three Honduran nationals, including the 14-year-old. Prosecutors also allege at least one migrant sent a desperate message to a loved one pleading for help before dying.

All 11 defendants are charged with conspiracy to transport illegal aliens resulting in death and aiding and abetting the transportation of illegal aliens resulting in death. If convicted, each could face up to life in prison.

After Garcia’s arrest, Seferino Huerta-Casillas is the last defendant in the case who remains at-large.