Police are still trying to solve the mystery of a nine-year-old girl who went missing after leaving her home - 49 years on from her disappearance.
Christine Markham was last seen on May 21, 1973 and has never been seen again. The police investigation has remained open and in the decades since, several theories have arisen as to what could have happened to her.
Grimsby Live reports that according to The Sun, some have suggested Christine was taken by the notorious Robert Black. Black kidnapped and murdered four girls between 1981-1986, but was also suspected of committing other child murders dating back to 1969. He was eventually caught in 1990 with a six year old girl in the back of his van.
