Federal authorities charged one man and are looking for another in connection with the attempted robbery, kidnapping, and shooting of a US Postal Service letter carrier in Dorchester just days before Christmas.

Maurice Williams Miner-Gittens, 23, was arrested Wednesday morning and charged with conspiracy to rob, attempted robbery, and kidnapping of a federal employee, and authorities are looking for Keyon Taylor, 21,, according to the US attorney’s office. Anyone with information about his whereabouts is asked to call US Postal Service inspectors at 877-876-2455. Authorities say he may be armed and should be considered dangerous, and that no one should independently try to apprehend him.

They each face up to life in prison on the kidnapping charges, up to 25 years on the charge of robbery of federal property, and five years on the conspiracy charges, the US attorney’s office said. The US Postal Service is offering a reward of up to $50,000 for information leading to Taylor’s arrest and conviction.

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After an initial appearance in US District Court in Boston today, Miner-Gittens was ordered held until a Jan. 27 detention hearing.

Authorities said that the two men were involved in the robbery of the letter carrier on Dec. 20, while the letter carrier was delivering holiday packages. Taylor allegedly jumped into the postal truck and put a pistol to his head. Authorities said a scuffle ensued, and that the letter carrier was shot in the wrist. Authorities say he was subsequently beaten with the pistol and kicked, and ordered to take off his postal uniform and lie face down.

Authorities said Taylor then took the letter carrier’s keys and drove the truck away. The letter carrier, who was bleeding and in fear for his life, jumped out of the back door of the truck and ran away, authorities said.

Taylor, according to authorities, meanwhile drove the truck a short distance before abandoning it and fleeing on foot. He allegedly left a trail of boot prints in the snow and his blood on a chain link fence, from a cut or wound on his hand. The trail of boot prints led through several back yards to a trash or recycling bin, which also had his blood on the handle. Authorities say they found the letter carrier’s uniform, cellphone, and personal keys in the bin.

Authorities said that Miner-Gittens rented and drove a U-Haul van that was used during the attempted robbery. The van had the letter carrier’s blood on the outside.

The US Postal Service investigated the shooting along with Boston police, which used its crime laboratory to analyze forensic evidence.