Mesa County Sheriff’s Deputy Alexander Zwinck is resigning effective Tuesday. Because of his decision, Phil Weiser can no longer sue him.

Colorado Attorney General Phil Weiser last week dropped his lawsuit against a Mesa County sheriff’s deputy whose decision to share information with federal immigration officials led to the June arrest of a 19-year-old college student from Utah.

Mesa County Sheriff’s Deputy Alexander Zwinck is resigning effective Tuesday. Because of his decision, Weiser, a Democrat, can no longer sue him under a Colorado law prohibiting state and local law enforcement from asking people about their immigration status. State law also prohibits officers from aiding in federal immigration enforcement outside of their criminal enforcement duties.

The lawsuit was dismissed by a judge Thursday.

Caroline Dias Goncalves, a University of Utah student studying nursing, was arrested by U.S. Immigration and Customs Enforcement agents June 5 shortly after she was pulled over by Zwinck for allegedly driving too close to a semitrailer on Interstate 70 near the town of Loma.

She told Zwinck, who is part of a group of state and federal law enforcement working on drug interdiction, during the traffic stop that she was born in Brazil. Zwinck had asked where she was born.

Dias Goncalves was released by Zwinck with a warning but then stopped and arrested by federal immigration agents a few miles down the road. She was taken to the immigration detention center in Aurora.

Zwinck shared information about Dias Goncalves in a chat among members of the drug interdiction unit on the encrypted messaging app Signal. It was in that chat that the Mesa County Sheriff’s Office says information was being passed along to ICE agents.