Brought to you by the letters W, T, & F…

Looking for some insight from the group. I’ve got an ‘06 Denali with nearly 200k on the clock. Drove it home Friday, parked as usual, and when I went to start it last night—nothing! Dash lights, blower, headlights, and all electrical systems seem fine, but it just won’t turn over.

Figuring it might be a low voltage issue, I put it on a trickle charger overnight, but no luck this morning. Could it be the starter? It’s been rock-solid since I got it, so this is a bit of a head-scratcher. Any thoughts?