My 03 denali's battery dies in the morning after sitting in the garage over night. the car starts fine after a jump start and allowing the battery to charge. I can let the car sit for 3 hours and it will start fine. I made sure no inter lights or running lights were on. can anyone tell me what else to check?

Their is a reset button on Jags you can't jump them or recharge the battery if they sit long .A lot of people have them and don't drive them in the winter .
I'm no export on Jaguars but I know their is a reset .The cruise control issue is the same in most vehicles it works with the brake switch ABS transmission vehicle speed sensors and the transmitter for the key less entree system .
I would say a battery issue .

You have a parasitic draw on the battery , Testing to find the draw isn't too hard ,all you need is a DMM - digital multi-meter . Test for voltage drop over the fuse's . I know GM vehicles had instrument cluster problems that would cause this problem , but test first . Watch these videos .
The BEST Way TO Perform Parasitic Draw Test
Chevrolet Truck Battery Dies Overnight Part

Parasitic draw is what's happening . Have see instrument clusters cause this ,as well as module's not powering down . You need to do testing to find the problem . Watch these videos an test .
Diagnose Battery Drain Parasitic Draw Chevy Trailblazer
The Trainer 27 3 Ways Of Finding The Cause Of Key Off Battery Drain...

weak alternator not charging the battery fully or an elictrical item in your vehicle using the power , like a light or radio etc

well it is a connection problem or something is draining battery over night. Check all cables. maybe explain a little more detail only in morning? does it sit all day and no problem just over nite? Does it crank but not start?

The bproblem ussually is there isnt enough fuel pressure try fuel filter first then if that does not cure it you will have to get new fuel pump.

Get the climate control computer relaced or reprogrammed. There is a good chance that when your vehicle was jump started it fried the climate system.

tell her to not use the radio at lunch ..she is draining the battery...replace battery..recommend gel type with deep cycle rating highest you will afford and if she must ..run engine at lunch time to charge system

need to have the alternator tested sounds like a bad voltage regulator.