The drug kingpin Estrada ran a successful drug cartel that was becoming too influential in Miami. Officer Harry Morgan of the Miami Metro Police Department began to investigate the cartel, implanting a CI by the name of Laura Moser to infiltrate the organization. She succeeded, however Estrada was tipped off by an underling of her contact with Harry, thus his anger took control and he ordered Lipsey as well as Welsh and Santos Jimenez to take care of this problem.
The three of them captured Laura as well as her sons Dexter and Brian Moser with the addition of several other people. They brought all of them to a shipping container located in the Shipping Yard and Santos used a chainsaw to kill everyone except the two children. Harry would later discover Dexter amongst the carnage three days later, bringing him home for adoption while Brian went to a psychiatric hospital for care.
While Estrada met his fate at the hands of Dexter in season 7 Santos was let off due to a lack of evidence surrounding his name. As for Lipsey and Welsh; Welsh was killed in a drug deal gone bad, and Lipsey is currently serving a life sentence without the possibility for parole.
- Season Seven retcons the events of Season Two, claiming that it was Hector Estrada, Santos Jimenez and Juan Pablo Aliso that killed Laura Moser, rather than Lipsey and Welsh with Jimenez. It could be however that Lipsey and Welsh were actually nicknames for Estrada and Juan Pablo, as Dexter mentions that one of the three men (prior to killing Jimenez) is dead and the other serves time in Prison (which would have been Estrada), though this is unconfirmed.