A deadly sinkhole in an industrial part of San Antonio swallowed two cars Sunday evening, killing one person and nearly trapping another who had to be rescued by passersby.

The chasm opened just after 7:30 p.m. in an area where the city is engaged in an “aggressive, vigorous, replacement program” for aging sewer pipes, San Antonio Mayor Ivy Taylor said at a news conference Monday.

The 12-foot sinkhole appeared near a connection between a pipe that was replaced a year ago and pipe that is decades old, officials said.

The Bexar County Sheriff’s Office identified the victim as a reserve sheriff’s deputy, Dora Linda Nishihara.

Her car was upside down, almost completely submerged and filled with gravel, dirt and other debris by the time emergency officials arrived.