An alleged drunk driver involved in a crash Sunday morning that killed a Catholic nun in Prince William County and left two other nuns gravely injured has a record of numerous motor vehicle violations in recent years, including two drunken-driving cases for which he served 20 days in jail, according to authorities and court records.

The suspect, Carlos A. Martinelly Montano, 23, an illegal immigrant from Bolivia, was also detained by U.S. Immigration and Customs Enforcement after a drunken-driving arrest in 2008. Montano was released on his own recognizance pending a deportation hearing, which has yet to occur because of a backlog, said ICE spokeswoman Cori Bassett.