The boys’ basketball coach at Nova High School in Davie was found in his minivan with a 17-year-old girl early Friday morning “doing something sexual,” according to a probable cause affidavit for his arrest.
Dequan Andre Sierra, 29, was arrested by deputies from the Broward Sheriff’s Office’s Weston District on one count of an authority figure soliciting or engaging in sexual conduct and one count of unlawful sexual activity with a person 16 or 17 years old. He has been released from jail after posting bail.
A man called 911 shortly before 5 a.m. Friday after finding his minor daughter in the backseat of a minivan with Sierra, who was the girl’s basketball coach, according to the redacted affidavit obtained by the South Florida Sun Sentinel through a public records request Monday. Deputies detained Sierra at the scene.
The girl’s father told deputies that he found them in the van parked about a block away from their home and removed them both from it, the affidavit said. His and his daughter’s names are redacted in the affidavit but his relation to the minor girl is clear in the document.
A Sheriff’s Office detective with the Special Victims Unit contacted Broward County Public School’s Special Investigations Unit and confirmed that Sierra was employed as a teacher aide, the affidavit said.
Further information was redacted in the document released Monday.
Sierra’s attorney information was not available Monday evening.
Broward County Public Schools’ athletic staff directory for 2025 shows that Sierra is the boys’ basketball coach at Nova High School in Davie. The school’s website as of Friday evening did not have Sierra listed as the coach.
“BCPS is deeply disturbed by the allegations and remains committed to ensuring a safe and supportive environment for all students,” John J. Sullivan, school district chief communications officer, said in a statement to the Sun Sentinel on Friday. “The employee in question will be reassigned away from the school and students pending the outcome of the investigation and will face termination if the allegations are substantiated.”
Also on Friday, Justice Livan Joseph, 27, a security monitor at West Broward High in Pembroke Pines, was arrested on the school’s campus on a warrant for sexual battery of a minor that occurred in Miami, where he lives, police said. The minor victim was not a student at West Broward High.