ENGLEWOOD, Colo. (AP) — Denver Broncos defensive end Antonio Smith is under investigation in Texas over a criminal allegation the local sheriff describes as “sexual in nature.”

Smith has not been arrested and no charges have been filed. TMZ first reported the investigation on Thursday.

Fort Bend County Sheriff Troy Nehls said a complaint was made against Smith in November and it was “sexual in nature.” After its investigation, the sheriff’s office forwarded its findings to the county District Attorney’s Office in February.

Prosecutors are still reviewing the matter.

The 33-year-old defensive end signed a one-year, $2 million deal with the Broncos on April 2.