When Daywalker is killed, he does seem to revive due to his Death Denied passive skill, but then there are bugs:

1) He does not attack all enemies when he is revived. 

2) He cannot be hit, does not take damage, has zero health when revived. Almost like he is still dead, but he appeared again. 

3) His character is displayed until the end of the round, but does not take a turn and cannot be attacked

OS: Android 9

Device: Samsung Galaxy S10