"He deserves every single day of the maximum sentence," Lambert said.
Gary Osier said he misses his son and regrets every day the life-changing mistake he made by leaving his son alone.
"I know what I did was a horrible, horrible mistake," Osier said. "I know there is nothing I can say that will bring my son back."
Osier said he didn't want to feel as if his life was completely ruined.
Defense attorney Gary Kryshak said his client appears to have been the victim of abuse as a child. Osier also suffers from post-traumatic stress disorder and schizophrenia, Kryshak said.