SAN ANTONIO - The Bexar County Sheriff's Office said it is investigating the death of a 53-year-old male inmate Monday.

However, BCSO said the inmate appears to have died of natural causes.

The exact cause of death is pending investigation, according to BCSO and the Bexar County Medical Examiner's office.

The inmate was in custody due to a criminal trespassing charge.

RELATED: Murder suspect dies in custody of ‘apparent suicide'

This also comes after a murder suspect died of an apparent suicide in BCSO custody last week.

More information was not immediately available. Refresh this page for the latest updates.