Crystal Palace boss Tony Pulis hailed his side's comeback against Liverpool as "amazing".
Palace scored three times in the last 11 minutes to come from 3-0 down to secure a point in their final home of the season.
"I said the game would open up in the second half, and we'd have a chance," Pulis said.
"Then they get the two and, at 3-0, you're staring down the barrel. When we got the first goal, I thought we'd have a squeak.
"Then everything took off, it was amazing. When the second goal went in, it was just a matter of time until we got the third."
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Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.