This takes place during the case Robber From the Darkness - Part 6
Commander Denulth played a small role in one of Meg's cases regarding Major Mary Rancour's disappearance, released as a teaser to Kindred Spirits. Talking to him revealed that he was not there for her abduction, as he was fighting trolls. He does assure the player that had he been there, he would've made sure it didn't happen.
The following takes place during the case Jewel Thief
Another case in Mega May involved a thief who stole from Herquin's Gems. The player learns that the suspect is an imperial guard with a limp. When Denulth is told of this, he realises who it is and is disgusted. As a result, he gives the player full permission to search the suspect's footlocker, and promises that he will be reprimanded accordingly.