Alastor/Marly
It was the message no one wanted to get. When the Healers contacted him at the office, Alastor did what needed to be done. He notified Potter and the leader of the Voldemort Taskforce, assuming they would need to check out the scene once they knew where Marlene had been. Then he sent a message to Dumbledore, Snape, and Potter's son to inform them of the incident and that he was en route to Mungo's. If Marlene had been conscious enough to give them names to contact, she likely would have given them Dumbledore's name as well. But, Alastor couldn't be sure until he saw her.
Only once the details were taken care of did he make his way to the hospital. Luckily -- or, perhaps unluckily for the poor woman behind the counter -- the mediwitch on duty had been one of those who'd been assigned to the wing he'd been in during his own stint in hospital earlier in the year and she was more than happy to direct him to where Marlene was being treated in return for not having to listen to him threaten everyone else in the hospital until he found where she was.
Another mediwitch was just leaving the room when he arrived, but she only gave him a look as she passed and didn't try to stop him going inside. Not wanting to disturb her if she was asleep, he moved quietly to the bed and took her hand gently in his.