Saint Stephen was one of the first ordained deacons of the Church. He was also the first Christian martyr. The Greek word from which we derive the English word martyr literally means witness. In that sense, every Christian is called to bear witness to Jesus Christ, in both their words and their actions. Not all are asked to shed their blood.
Those who do shed their blood for the faith are the greatest of witnesses. They have been especially honored since the very beginning of Christianity. Stephen was so conformed to Jesus in his holy life that his martyrdom was both a natural and supernatural sign of his love for the Lord. It also inspired the early believers as they faced the first round of brutal persecution.
His behavior, even forgiving those who were taking his life while he was being stoned to death, was a beautiful reflection of how conformed he truly was to the Lord Jesus Christ. It is recorded in Chapter 7 of the Acts of the Apostles (Acts 7:54-60), which immediately follows the Gospels in the New Testament.
The 6th chapter of the Acts of the Apostles contains an account of the choice of the first seven deacons of the Church. As the Apostles worked to continue the ministry of Jesus Christ as his elders, some of the Greek-speaking widows were being neglected in their practical needs. The Twelve decided to ordain seven deacons to oversee their care. In doing so, the deacons extended the pastoral care of the Apostles, the first Bishops of the early Church, enabling them to attend more to teaching.