Comment by Kattz on MikaMistake

@MikaMistake i replied to your comment about this in the last chapter so this reply is more for people who didn't read that since they wouldn't get the notification like you would as the OP:

The series of events were:
1. Couple leaves to go out one day
2. They died of poison
3. Their bodies were tossed into the lake
4. They were found 6 months later and believed to have died of drowning due to either suicide or an accident 
5. With modern investigation techniques, it was found out that they didn't die from drowning, they died from poison
6. That ruled out suicide or an accident because if they died from poison before getting into the water, then they wouldn't have been able to die from drowning as the killer originally made it seem like they did. Because they were already dead so they wouldn't have been able to get into the water by themselves.