Los Angeles police are looking for a hit-and-run driver who struck a 70-year-old nun, leaving her in critical condition.

Police on Thursday asked for public help in finding the driver of a black truck that struck Raquel Diaz in a Boyle Heights neighborhood crosswalk last Sunday.

Diaz is director of religious education at the Church of Assumption on Blanchard Street.

The city is offering a reward of up to $25,000 for information leading to an arrest and conviction.