A popular math teacher at San Leandro High School is accused of two felonies, related to an ongoing sexual relationship with a teenage girl.
Leon Chang, 27, turned himself in to police Thursday afternoon.
He’s facing statutory rape charges and contacting a minor for lewd purposes.
"She's a senior, and it's been going on since junior year," student Ramon Cuevas told KTVU, "One of the teachers caught them in the act and reported it to the administration.”
Without going into details, San Leandro Police confirm they were alerted to the inappropriate contact by school personnel.
"We have a great relationship with the school district," Lt. Mike Sobek told KTVU, "and they called us at the right time."
Investigators have been working on the case for a few months, developing forensic evidence before seeking charges.
"These are highly sensitive cases," added Sobek.
Chang has been teaching math at San Leandro High School for almost six years, and in an online profile, described himself as an activities director and a coach of various sports at the school.
Videos he has posted online show skits and flash-mob dances he has orchestrated with students.
"It just all went to waste but he was a great teacher," senior Ramon Cuevas told KTVU, "I loved him, I actually loved him as a teacher."
School is on spring break this week, and the students say the affair, and fall-out, will be a big distraction when students and staff return Monday.
The San Leandro Unified School District issued a letter to parents, acknowledging it is "deeply concerned" about the allegations, and has suspended Chang without pay and directed him "not to return to work or be on district property.”
"It's always surprising when it's a teacher," said Lt. Sobek, "It's always unfortunate."
Sobek said Chang surrendered to San Jose Police, not San Leandro, and may have family in the South Bay.
He is currently out on bail, but no one answered the door at his Oakland condominium. Neighbors said he lives there with his wife of two years.
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