An 88-year-old man with dementia who went missing from his Northwest Washington home last month is believed to be the person found dead in a ravine near Rock Creek Park on Sunday, according to D.C. police.

John Matthews (D.C. police)

D.C. police said a cause of death is pending an autopsy.

While authorities are working to positively identify the man, police said in a statement that they believe the body is that of John Matthews.

Matthews had last been seen Dec. 10 leaving his home in the 1400 block of Oglethrope Street NW, a little more than two miles south of where the body was found. At the time of his disappearance, police said he was wearing brown pants, a blue sweater and a maroon vest. Police said he suffered from dementia and required medication.