If I caught an alligator gar of that size, I'd put it in my pond and call it "Fluffy." 
I'm mixed on whether they did the right thing by killing it and donating it to a museum. On one hand, such a huge fish probably has (well, had) many more years left to live in relative peace. On the other hand, it's the largest one found yet, so having it preserved for study could help for us to learn more about these magnificent creatures.

I'm mixed on whether they did the right thing by killing it and donating it to a museum. On one hand, such a huge fish probably has (well, had) many more years left to live in relative peace. On the other hand, it's the largest one found yet, so having it preserved for study could help for us to learn more about these magnificent creatures.