Pall bearers carried the casket of Krystle Campbell from St. Joseph's Church.

Cardinal Sean O'Malley (second left) took part in the funeral procession for Krystle Campbell.

Krystle Campbell’s mother, Patty Campbell (second right), and brother Billy Campbell (right), talked with Cardinal Sean O'Malley outside St. Joseph's Church following her funeral in Medford.

Family, friends and mourners of Krystle Campbell embraced outside of St. Joseph's Church following Campbell's funeral.

Mourners left the funeral Mass for Krystle Campbell.

Jaime Caputo (center) held an American flag outside the church.

The casket containing the body of Krystle Campbell arrived at St. Joseph Church for her funeral Mass in Medford.

William and Patty Campbell, parents of Krystle Campbell, arrived at St. Joseph's Church with their son Billy (left) for the funeral.

The hearse transporting of Krystle Campbell was escorted by a large police contingent.

Family, friends, and mourners of Krystle Campbell entered St. Joseph's Church before the start of Campbell's funeral.

Many were in tears during the funeral for the Boston Marathon bomb victim Krystle Campbell at St. Joseph Church in Medford.

Mourners reacted as a hearse arrived at St. Joseph Catholic Church.

Cardinal Sean O'Malley waved to the people waiting to enter St. Joseph's Church.

Governor Deval Patrick entered St. Joseph's Church before the start of Campbell's funeral in Medford.

People lined up along the sidewalk to pay their respects during the funeral of Krystle Campbell.

A woman carried a sign before the funeral for Krystle Campbell in Medford.

Line of Honor outside St. Joseph’s Church in Medford.

A sign reading “R.I.P. Krystle Campbell In Our Heart Forever,” was posted in Medford Square, near St. Joseph's Church (background) where Campbell's funeral is held.

A flag draped Medford City Hall in honor of Boston Marathon victim Krystle Campbell.

Devon Morancie wore a flag on his back as a crowd gathered outside the funeral for Boston Marathon bomb victim Krystle Campbell.

Devon Morancie of Littleton hung a flag for victims of the Boston Marathon bombings.