From our friends at KATC :

LAFAYETTE, La. (AP) - A search of Brandon Scott Lavergne's home in the investigation of Mickey Shunick's death uncovered the driver's license of a Texas woman whose whereabouts remain unknown. That's according to a review of a case file released Monday.

The case file documents what Lafayette Police Chief Jim Craft characterized Monday as "the biggest and most complicated and involved investigation that I am aware of in the history of the Police Department."

Lavergne is serving a life sentence after pleading guilty in August to two counts of first-degree murder in the slayings of Shunick, 21, and Lisa Pate, 35.

Lavergne, 33, admitted to killing Shunick after abducting the University of Louisiana at Lafayette student on May 19.

Pate's remains were discovered in rural Acadia Parish in 1999.

The Advocate reports detectives found the wallet and driver's license of Madeline Aumiller in a search of Lavergne's home on July 5.

Detectives tracked down the woman's brother, who said that she had been living with him but that he had asked her to move out "due to too many problems he could not deal with," according to the case file.

The brother said he had continued to put money in his sister's bank account but that she had not accessed the account since at least April, according to the case file.

Prosecutor Roger Hamilton, who was involved in the Shunick investigation, said Monday that information about the driver's license was forwarded to other jurisdictions outside of Louisiana but that he has heard nothing about whether the woman has been located or whether Lavergne was connected to her in any way.

Hamilton did confirm that Lavergne is not considered a suspect in any local disappearances or unsolved crimes.

"We didn't find anything else to suggest any other crimes committed in the Acadiana area," he said.