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“Sometimes, it takes a substantial period of time to actually determine what we’re actually dealing with.”

While no cause of death has been released, investigators believe the fatal injuries were inflicted on Cyrus within the family home.

Asked whether the family has been co-operative, Coleman said the parents have “participated” in the investigation but have offered, in the opinion of investigators, “no plausible explanation” for Cyrus’s injuries.

Dan Nel is listed as an associate pastor on the Rockyview Alliance Church’s website.

“Dan and Leah and their families are experiencing an overwhelming measure of sadness. That said, the presence and comfort of God has also been evident throughout these difficult days,” wrote Rockyview Alliance Church Pastor Shawn Vickar on a Facebook post announcing Cyrus’s death in September 2015.

In blog posts which have now been taken down, both parents expressed their grief over the death of Cyrus and all the things the couple would never be able to do with their son.

“As his father I wanted to teach him how to ride his first bike, Leah wanted to take him swimming the list goes on,” Dan wrote on Nov. 17, 2015. “On a deeper level we wanted to see our son grow up into a man of integrity, a man of courage, and a man who loved God more than anything.”

“We do not know the physical reason why Cyrus stopped breathing properly while he was in his crib,” Leah wrote on Jan. 6, 2016. “Dan noticed his distress and did everything he could to help him; but, still Cyrus could not breath and his heart stopped.”

Nel is next scheduled to be in court on Wednesday, May 24, 2017, police said.