But now that he is dead, that means I gotta be the captain.

但是，既然他已经不在了，那意味着我得当船长了。
“now that”引导的句型有“事已至此”的含义，注意它在口语中的应用和“since”颇有相似之处：

1. Now that you’re here, why not have a drink?
既然你都来了，还是喝一杯吧。

2. Now that Joe is out of town, we’ll have the party without him. Joe
不在，我们只好不要他来参加晚会了。