I’ve only seen the news article stating that the Homicide Unit (along with FBI) is investigating. I haven’t seen it specifically stating that there has been a homicide or the reason for the first investigation.
I’m not sure if Homicide would only investigate known homicides or would they also participate if it was suspicious missing persons?
From the link:
On March 27, FPD's Homicide Unit, and the FBI searched three locations in Fayetteville as part of the expanding investigation to find Blake.
In a startling revelation, Fayetteville Police said that as the search for a missing teenager unfolds, one of his relatives may also be missing.
abc11.com