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I reckon you could impress me by contributing to it. Don't be shy now.
Mac and his brother Davey were two criminals who joined into Dutch van der Linde's gang at some point in the past. According to Charles Smith, they were both rather violent. Additionally, according to Uncle, Mac once beat up fifteen sailors.
In 1899, the Van der Linde gang attempted to rob a ferry in the town of Blackwater. However, things turned sour and both Callander brothers were injured; though Davey was rescued and taken with the gang as they fled for the mountains, Mac was separated from them and had to escape on his own.
Mac was eventually caught and killed by the Pinkerton National Detective Agency. Andrew Milton claims that Mac was already "shot up" by the time they caught him and considered killing him "slow but merciful".
Events of Red Dead Redemption 2
Mac was mentioned several times by Arthur Morgan and other members of the gang, who lamented his absence and surmises that Mac died as Davey did.
Horseshoe Overlook Chapter
While fishing with Jack Marston, Arthur is approached by Andrew Milton and Edgar Ross, and the former reveals what happened to Mac and uses his death to taunt Arthur. Jack, being too young to have understood the situation at the time, expresses concern for Mac's safety, and Arthur reassures him by saying that Mac might be somewhere safe.
His death would be mourned by the gang members, one of them being Bill Williamson, who fondly says Mac was the type of man that you'd just want to rob with.
Beaver Hollow Chapter
When Arthur reveals to Charles that he is sick and dying, Charles tells Arthur that he has the chance to make amends, unlike many of the other gang members, including Mac and Davey, saying that the brothers were a “vicious pair of bastards” and that’s all they ever were and will be.