A grand jury formally charged Lavergne with two murders yesterday.
Lavergne was a prime suspect in the Shunick case.
Sources still don't know how investigators connected Lavergne to the Pate murder.
Sources also said today that investigators are reopening several murder and missing person cases that have gone cold even the ones that aren't in Louisiana.
Kip Judice with the Lafayete Parish Sheriff's Office says its too early to label Lavergne a serial killer.
Police do believe Lavergne may have more victims.
Lavergne heads back to court next Friday.