Even though the Scriptural account implies that God struck down Ananias and Sapphira, the Law & Order SVU episode watching side of me can't help but conclude that Peter and his henchmen probably killed the couple. It would make perfect sense from a criminal aspect, and also set a precedent for how the Church would operate from then on. Not to mention the incident fits in harmony with what we know about Peter's personality. What Tammy said regarding Christ's portrayal of his Father resonates with me after reading something from another blog regarding this account.
Peter appears to be the Capo according to this account, but considering the circumcision issue and Paul's missionary work, Peter's not the only one with influence. Those early Christians faced persecution, as well as dissention within their ranks which did eventually result in a fragmentation of the Church, dissolving what little unity they probably had. Before this happens, Peter was probably all too aware and seeking ways to maintain Cosa Nostra(Our Thing). Just like the WT today will eat their own before allowing any dissention which they fear could lead to disunity, Peter was willing to go to whatever extent necessary to maintain unity. So when Ananias came up short with the dough, Peter said, "hell no! You gotta go!" So he killed the husband first, with no witnesses, or at least no witnesses that would expose his hand, possibly even giving him a hand. Did the same to the wife, and told his henchmen to spread the word that this is what happens when you lie to God. Just like the Watchtower and God are synonomous to the average JW, the same it was with Peter and The Lord.
After it was all said and done, Peter was able to control the faithful through fear as well as maintaining an income. Even when Peter wasn't around, this event probably had the people so shook and paranoid that they did his bidding anyway. To this day organized religion operates the same way, including cults like Scientology. The other thing is God striking down Ananias and Sapphira fits perfectly in harmony with the God in the Old Testament. It doesn't however fit in with Christ's representation of God, but it does fit Peter's personality. Brash, hot-headed, distrustful of people, overly concerned with how viewed by others, etc.. I'm just thinking out loud, but I think Peter and his outfit were responsible for the couple's death.