Walker replaced Richard McAlevey in January 2010 but has returned to Dunedin.
There is an illness on his wife's side of the family and the couple felt it was the right decision to return.
He finished up on October 14 and experienced groundsman Colin Buttar is standing in until the contractor Asplundh can find a suitable replacement.
"I had a meeting last week with a couple of council representatives and Shayne O'Connor from Otago Country Cricket just to check what was being done and I'm quite satisfied they're on track and have a good system in place to monitor progress," Dykes said.
Molyneux Park lost the right to host elite cricket following unsatisfactory pitch reports at the end of the 2008-09 season and failed to get up to scratch for the following summer.
Otago hosted a one-dayer and a twenty/20 match at the venue last summer and another twenty/20 fixture is scheduled for December 29.
Central Otago District Council parks and recreation manager Mat Begg said the Molyneux Park Trust had been responsible for operating the venue but handed control back to the council last month and was in the process of winding up. The council had employed Asplundh to prepare and maintain the grounds.
It is a different company from the one which is charged with preparing the University Oval, butDykes said that did not necessarily mean the groundsmen would not continue to share ideas or work together.
Dykes added New Zealand cricket turf manager Ian McKendry was aware of the situation at Molyneux Park and would be making visits to check progress.
Applications for the groundsman role closed on October 14 and Asplundh area manager Alan Page said the company hoped to fill the position "shortly".
Meanwhile, Walker is back working for Delta and will assist Tom Tamati preparing the University Oval.
