A former children's hockey coach pleaded guilty Monday to dozens of sexual offence charges relating to nine victims going back decades.

In September 2013 Ottawa police first charged Kelly Jones, 58, of Ottawa, after allegations he had sexually assaulted a boy who played for a hockey team Jones coached. The incidents took place at Jones' apartment and, later, at a house Jones purchased.

In that case, police charged Jones with sexual assault, sexual interference, invitation to sexual touching and sexual exploitation of a young male.

Kelly Jones former hockey coach sexual assault charged

Kelly Jones, a former bantam level hockey coach, pleaded guilty Monday to sexual offence charges relating to nine victims. (Supplied photo)

Then, in October 2013, police laid more than 30 additional charges against Jones, including sexual assault, sexual interference, invitation to sexual touching and sexual exploitation and intimidation.

More victims had come forward to police after hearing about the first case in media reports.

The second set of charges related to multiple incidents going back decades, some of which took place at Jones's residence. The victims were minor hockey players, baseball players and boys Jones came into contact with at a grocery store he worked at.

One assault took place during a camping trip in Algonquin Park. Jones invited a boy to go camping with Jones and his son, but when the boy arrived Jones said his son wasn't able to come. Jones and the boy then headed into Algonquin Park, where Jones told the boy to tell a park ranger he was Jones' son.

The assault took place in a cabin, according to court documents. When the boy cried and asked to go home, Jones told the boy he would be the one to decide when they would leave.

In total, the charges laid against Jones involved 10 alleged victims, who ranged in age from 7 to 15 years old at the time.

Jones pleaded guilty Monday to charges relating to nine of the 10 alleged victims.

Jones remains out on bail. Sentencing is expected to take place on June 25.