Homicide detectives are conducting an investigation into the disappearance of Douglas Hill. (OPP)

OPP and Six Nations Police are hoping someone has information about an SUV that's linked to a homicide investigation into the disappearance of Six Nations man Douglas Hill.

Hill was last seen on Six Nations of The Grand River Territory on Saturday, June 24 at around 9 a.m. Investigators have classified Hill's disappearance as a homicide, though they offered no details as to what led them to that conclusion.

A 17-year-old girl was arrested earlier this month and charged with second-degree murder in connection with the case. A 35-year-old woman from Brantford, Ont., has also been charged with one count of accessory after the fact to murder.

Investigators now say that they are looking to speak to witnesses who may have seen a dark coloured Chevrolet or GMC SUV with dark tinted windows and possible front end damage.

The SUV was seen on the day Hill vanished, in the area of Sutherland Road also known as Chippewa Road or Side Road 8 of the Chippewa of the Thames First Nation.

Police are trying to find anyone who might have information about the direction the vehicle was going through Chippewa of the Thames First Nation, Muncey, Ont. or Oneida First Nations.

"I am encouraging anyone with information to contact police," said Chief Glenn Lickers of the Six Nations Police Service in a statement.

"Someone knows something about this investigation and we need them to have the courage to come forward."

Anyone with information is asked to call the OPP at 1-888-310-1122 or Six Nations Police at 519-445-2811.

You can also call Crime Stoppers at 1-800-222-8477 or leave an anonymous online message at www.helpsolvecrime.com.

Police say people with a tip "may be eligible to receive a cash reward of up to $2,000."