The Brief

The Collin County Sheriff's Office confirms Assistant Chief Deputy William Armstrong, Dylan Harrison’s scuba instructor, resigned last week.

Armstrong’s resignation comes amid questions about missing dive computer data that could explain what led to the 12-year-old’s death during a scuba class.

The Kaufman County Sheriff’s Office now says Dylan’s case remains an open investigation after initially being marked closed.

TERRELL, Texas - There has been an update on FOX 4's investigation into the death of Dylan Harrison during her scuba class.

FOX 4 has learned that the instructor, an assistant chief deputy with the Collin County Sheriff's Office, resigned last week.

Instructor's resignation

What we know:

This morning, Sheriff Jim Skinner confirmed to me that Assistant Chief

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