question about my cat

[Raquel]

I got a question. Me and my dad got a tick off my 10 year old cat. 3 weeks later my cat passed. I had noticed that 2 weeks before my cat passed that his appetite had decreased and he had become more sluggish. However, he was still moving around. The day before he passed he ate good and was energetic. Could the tick we found on the cat brought this on or what? He seemed like he was doing good the day before it happened.