LINCOLN COUNTY, Mo. — The Lincoln County Sheriff's Office needs your help to shed light on a cold case from 1991.
The sheriff's office said Thursday it is seeking the public's help in gathering information on the disappearance of Arlin Henderson.
Arlin was 11 when he went missing. He was last seen at 5 p.m. July 25, 1991, while riding his bicycle near his home in the Fountain N' Lakes subdivision in Moscow Mills.
The boy's bicycle was found about 11 weeks later in a bean field off of North Ethlyn Road, about 5 miles away from where he was last seen near his home.
Arlin, who's first name is Charles, was referred to by his middle name in news coverage at the time of his disappearance.
On March 10, 2000, Arlin's sister, Joy Henderson-Leonard was killed by her husband, Robert "Bob" Leonard, who then killed himself after her death.
Investigators said they believe that Joy and Bob had crucial information in Arlin's disappearance.
"We’ve learned they made some comments that may have been relevant to this investigation," Lincoln County Sheriff's Capt. David Hill said. "They are no longer with us so we can't speak with them. So the purpose of the media release is to find people who knew them."
The Lincoln County Sheriff's Office asks anyone who associated with Joy and Bob Leonard to come forward and speak to investigators about what they know to help close the case on Arlin's disappearance.
Photos of Arlin prior to his disappearance and what he may look like today were released by the sheriff's office to aid in the investigation.
Police also released a photo of the bicycle Arlin was last seen riding that was found in the bean field.
The lead investigator on the case, Lincoln County Sheriff's Capt.Wade O'Heron, said there are several leads on this case.
O'Heron explained this investigation is not solely the work of the sheriff's office, but also a collaborative effort among several different agencies.
"It is my opinion that a collaborative approach to this investigation may yield better results in finding answers needed to solve this case," he added.
5 On Your Side spoke to Arlin's mom, Debbie Henderson, who said, "Someday I will get answers."
Anyone who has information related to the case or who was associated with Joy and Bob Leonard should contact the Lincoln County Sheriff's Office at 636-462-6153 or submit a tip by clicking here.
Investigators said information can be given anonymously.
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