Terrible, sad story with very little follow up since shooter killed himself. Revenge killings do happen, but usually the person who has enraged the attacker is killed, not their spouse.
However, a kinda sorta similar revenge-themed killing/suicide happened a few weeks ago when a wife killed her rival then herself. She wanted to hurt her husband emotionally by taking away his new love, not his life. Then she killed herself, although she arrived in town with a disguise (did she change her mind after the murder?). It seemed unusual because both women were successful, ambitious professionals. The wife texted her husband minutes before from inside the rivals home as she lay in wait (an enclosed, indoor space, not outside). He was waiting for the new love at a restaurant. Planned for weeks. I do wonder whether she was trying to lure husband there to kill him, too, but the timing didn't work out. He arrived on the scene shortly thereafter. ANYWAY, I'm getting off track...
https://www.delawareonline.com/story/news/crime/2018/04/24/pennsylvania-murder-suicide-involves-delaware-woman/545135002/
The connection to this case seems tenuous in terms of circumstances. I don't see this case as that type of revenge murder because no motive seems evident. Only if we stretchhhh could we speculate about Florida guy's love life and wonder if he had a girlfriend who took offense, but that seems ridiculous. And how would she know the route? Ally's ex lied to police about certain details--which ones and why? The police didn't elaborate, unfortunately, but if one has no connection to the crime, why lie at such an important time?