I haven't noticed any irregularities from villain. What do you put him on with his flat on the flop? I assumed he was a typical 50nl donk and had some form of a flush draw or possibly 44 and A4. The king on the turn didn't really scare me so i led for 40 not really thinking about what i would do if he were to push over me. I was pretty set in stone going into the turn that he had a flush draw so i was quite surprised when he check raised me. Do you put AK in his range now? Is this a call and puke solely based on the size of the pot or is a fold in need here?

Also, is 40 to much on the turn? If so what would be more appropriate?

lakers99 $131.59
starrent $88.62
HERO $112.89

kshaun Ante/Small blind $ 0.25
lakers99 Big blind/Bring in $ 0.50
kshaun Card dealt to a spot
lakers99 Card dealt to a spot
starrent Card dealt to a spot
jackduck Card dealt to a spot
HERO Card dealt to a spot Ah Qc
starrent Call $ 0.50
jackduck Fold
HERO Raise $ 2.00
kshaun Call $ 1.75
lakers99 Call $ 1.50
starrent Call $ 1.50

Betting round completed Last active pot = $8.00
Card dealt to table Ac Qs 4c

kshaun Check
lakers99 Check
starrent Bet $ 6.00
HERO Raise $ 20.00
kshaun Fold
lakers99 Call $ 20.00
starrent Fold

Betting round completed Last active pot = $54.00
Card dealt to table Kh

lakers99 Check
HERO Bet $ 40.00
lakers99 All-in $ 109.59
HERO (50.89) ?