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The boyfriend of a 12-year-old girl whose body was found in a Houston creek said he heard her speaking with 2 adults before she was killed.

Houston police said the girl sneaked out of her apartment between 10 p.m. and midnight on Sunday. She was on the phone with her 13-year-old boyfriend when she left the apartment.

The boy told police he heard her speaking with 2 adults at a convenience store just before midnight.

Her body was found in a north Houston creek early Monday.

Police said someone called 911 around 6 a.m. Monday about a childโ€™s body in a ditch. She was found not far from her apartment.

Mayor John Whitmire released new details about the case in a press conference on Monday evening.

According to Whitmire, the girlโ€™s mother last saw her around 10 p.m. Sunday when she put her children to bed.

Whitmire said the girl left home while talking with her 13-year-old boyfriend on the phone that night.

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โ€œIt appears that he last talked to her at a convenience store around midnight, heard her talking to two grown-upsโ€ Whitmire said.

Police are reviewing surveillance videos for clues to the killerโ€™s identity.