An LLC with more than member that goes to a single member does NOT need a new EIN.

https://sa.www4.irs.gov/modiein/individual/help/help-toc.jsp

However, the EIN for an LLC is only used for payroll and excise taxes.  For income tax purposes (such as filling out a W-9 and receiving 1099s), the W-9 instructions indicate that they would want to use an EIN under the name of the individual person (not in the name of the LLC).