AK, line check vs donk

[Luckyz]

villian is 50/5 something,
flopcall was misclick,
he thought for 3secs and pots river,
anyone call?

No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Pre-flop: (6 players) hero is Button with A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG folds, UTG+1 calls, CO folds, <font color="#cc0000">hero raises to $5</font>, 2 folds, UTG+1 calls.

Flop: 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/club.gif[/img] ($11.5, 2 players)
<font color="#cc0000">UTG+1 bets $2</font>, hero calls.

Turn: 2[img]/images/graemlins/club.gif[/img] ($15.5, 2 players)
<font color="#cc0000">UTG+1 bets $4</font>, <font color="#cc0000">hero raises to $15</font>, UTG+1 calls.

River: 8[img]/images/graemlins/spade.gif[/img] ($45.5, 2 players)
<font color="#cc0000">UTG+1 bets $46.62</font>, hero ??