Whether by Death or By Life
"as it is my eager expectation and hope that I will not be at all ashamed, but that with full courage now as always Christ will be honored in my body, whether by life or by death." Philippians 1:20

This is the heart of the Christian. May God be glorified in the deaths of these dear saints as much as in life. May God be glorified in the church's response and love for each other. Pray that God would use this awful tragedy for His Glory just as he used even his own son's death for his glory.

Mourn With Those Who Mourn
If one member suffers, all suffer together; if one member is honored, all rejoice together. - 1 Corinthians 12:26

While we are not the same local church, we are together the body of Christ. In prayer, we can join them in the sorrow of death. Death is still an enemy even if it is an enemy over which we enjoy eternal victory through Christ's resurrection. It's a real sorrow when life ends and it's right to mourn together. Who knows how many daughters and sons and grandchildren are grieving tonight. 

For Pastoral Ministry
For you know how, like a father with his children, we exhorted each one of you and encouraged you and charged you to walk in a manner worthy of God, who calls you into his own kingdom and glory. 1 Thessalonians 2:11-12

I've heard (not entirely sure) the pastor is very new there. Either way, pray for the pastor and their staff as the minister to a whole group of families and a church dealing with shock and grief.

For God's Comfort
Even though I walk through the valley of the shadow of death, I will fear no evil, for you are with me; your rod and your staff, they comfort me. Psalm 23:4

Pray for God to be the supernatural source of comfort for the whole church body and the families. Pray all involved would find peace with God's will, his plans, and his sovereign hand in the valley of death.

God, be gracious.