A University of Texas at San Antonio professor who owns an engineering company allegedly admitted to sexually exploiting an employee who was also his former student, according to a lawsuit filed in Bexar County.

Manuel Diaz, an engineering professor at UTSA and owner of Star Engineering Group, Inc., is accused of “sexual voyeurism and exploitation” of employee Edith Estrada-Contreras in September during a work trip to Houston.

The lawsuit was filed Nov. 19 in the 166th District Court by Estrada-Contreras.

After checking into a hotel, Diaz returned to a truck after about 25 minutes and gave Estrada-Contreras only one room key. The suit alleges Diaz used the time alone to “flip the peep hole” in her hotel room.

A hotel clerk and another guest told Estrada-Contreras they saw Diaz “looking

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