Nancy Grace Questioning Official Narrative in Nolan Wells Death

Nancy Grace is diving into the Nolan Wells death investigation ... and she's not convinced this is a drowning ... raising concerns about some suspicious allegations involving his cell phone.

Nancy had her first segment on Nolan on her 'Crime Stories' show ... and she was particularly focused on his mother, Christine Wonsley, going on national TV and claiming his messages were deleted.

Nancy and her guest -- New York Post correspondent Caitlyn Becker -- said the alleged phone tampering was strange.

While the two ladies aren't presenting any new info here ... it's clear Nancy is on the case.

Nolan's funeral was held Monday and featured appearances from some prominent personalities ... including Rev. Al Sharpton and Tyler Perry. The pair offered a collective $100K for information leading to an arrest and conviction in the teenager's case.

As you know ... Nolan's body was found floating off the coast of Horn Island on July 6, a couple of days after he went missing. Cops have ruled the death an accidental drowning -- though the investigation remains ongoing.

The family's attorney -- Ben Crump -- isn't buying the official explanation either ... theorizing Mississippi authorities are trying to sweep the death of a young Black kid under the rug.