Updated August 10: Revised with Mikayla's cause of death.

The teenage girl whose body was found floating in a South Dallas creek last month was stabbed multiple times, officials said.

Mikayla Mitchell (Facebook)

Mikayla M. Mitchell, 17, was found dead about 11:40 a.m. July 16 in the 3000 block of Rochester Street. Her death occurred less than a week after the arrest of her stepfather, a North Texas doctor accused in several overdose deaths.

Mikayla died of multiple stab and incise wounds, the Dallas County medical examiner said.

There is no new information in the case, police said Thursday.

Howard Gregg Diamond (Fannin County Sheriff's Office)

Mikayla was the stepdaughter of Sherman-based physician Howard Gregg Diamond.

Diamond, 56, the principal physician at the Diamondback Pain and Wellness Center, was arrested July 11 on a number of charges including conspiracy to distribute controlled substances, possession with intent to distribute controlled substances, health care fraud and money laundering.

Federal authorities say Diamond conspired with others to write unnecessary prescriptions for highly addictive painkillers, resulting in seven deaths in Texas and Oklahoma from 2012 to 2016. One of the deaths was in McKinney.

Pete Schulte, Diamond's attorney, said on Twitter that there was no connection between his client's charges and his stepdaughter's death. He said the family was "devastated."

Media is ruthless. There is no connection between my client Dr. Diamonds' charges & his step-daughters death. Client & family devastated — Lawyer Pete Schulte (@AttyPeteSchulte) July 18, 2017

According to data from the federal Centers for Medicare & Medicaid Services, Diamond wrote the second-most prescriptions for opioids in Texas in 2014, and the 24th-most in the country.

Diamond, who is being held in the Fannin County jail, faces up to life in prison if convicted.

Anyone with information about the case is asked to call Detective Steven David at 214-671-3627 or email steven.david@dpd.dallascityhall.com.

Crime Stoppers will pay up to $5,000 for information leading to an arrest and indictment. Tips may be made to Crime Stoppers at 214-373-8477.