Melissa McKinnies, a woman who was involved in the Ferguson, Missouri protests in 2014, claims that her 24-year-old son has been lynched.

The body of Dayne Jones was found October 17, hanging from a bed sheet in a wooded area near the home he shared with his mother.

But local law enforcement are investigating Jones' death as a suicide.

ST. LOUIS (AP) — Authorities are investigating the death of a Ferguson protester's son as a suicide, although a message on social media posted by his mother has sparked assertions that it was a lynching.

Melissa McKinnies, who was active in the St. Louis suburb after the fatal police shooting of Michael Brown in 2014, posted the Facebook message, saying "They lynched my baby."

The message, which Facebook later removed, began trending on Twitter and Reddit, causing people online and in the community to press officials for more answers about the death of 24-year-old Danye Jones.

His body was found on October 17, near the north St. Louis County home he and his mother shared.

St. Louis County police spokesman Shawn McGuire said Wednesday that Jones' body was found in a wooded area behind the home. A police report lists "suicide" as the nature of the investigation.

The medical examiner's determination of the cause of death could take several weeks. Administrator Suzanne McCune said the office doesn't issue preliminary findings.

McKinnies does not have a listed phone number. But the Rev. Darryl Gray, a leading St. Louis activist who has met with McKinnies several times since her son's death, confirmed McKinnies' Facebook posting. Gray said it was Facebook, not McKinnies, who took it down.

The posting showed pictures of McKinnies' son hanging from what appeared to be a bedsheet. It read, "They lynched my baby."

A rally in support of Jones is scheduled for Thursday outside the St. Louis County Justice Center in Clayton, Missouri.

McKinnies was among thousands who took to the streets in Ferguson, Missouri, after Brown's death on August 9, 2014. Brown, a black and unarmed 18-year-old, was fatally shot by white officer Darren Wilson during a street confrontation. Wilson was not charged and later resigned, but the shooting led to months of protests and helped give rise to the Black Lives Matter movement.

Read More: Michael Brown was fatally shot by a police officer in Ferguson 3 years ago — here's how his death is being commemorated

Gray said he was unaware of any evidence indicating foul play. But he said McKinnies and other activists from Ferguson are often harassed and threatened via text and social media.

"She believes (Jones' death) was meant as a message to her," Gray said.

Police continue to investigate the deaths of two prominent Ferguson protesters, both of whom were found killed inside of torched vehicles — DeAndre Joshua in November 2014 and Darren Seals in September 2016.